Wow, this is great work! I'm very interested in this family as my God-daughter is a descendant of Rudolph Fischer. I'm wondering if anything more has been learned about his death in March of 1944? I see you saw a reference to it ... I couldn't find him on FindAGrave, just wondering if anything more is known about him or who his parents are or who his wife's parents are? Barbara's maiden name is Gams from what I've been able to learn.
I plan on mapping out my niece's chart for xmas ... so in a little bit of a hurry. Apparently the family doesn't know much about Rudolph's origins except for what you uncovered above.